Superconductivity and magnetism in Y1−xPrxSr2Cu2.7Mo0.3O7−δ

H. D. Yang; H. L. Tsay; C. R. Shih; Y. C. Chen

doi:10.1103/PhysRevB.51.8543

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Superconductivity and magnetism in Y1−xPrxSr2Cu2.7Mo0.3O7−δ

H. D. Yang, H. L. Tsay, C. R. Shih, Y. C. Chen

DOI 10.1103/PhysRevB.51.8543 · Physical Review B

T1

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Abstract

Polycrystalline samples of Y1−xPrxSr2Cu2.7Mo0.3O7−δ (0≤x≤1) with tetragonal perovskite-like structure were synthesized and investigated by powder x-ray-diffraction, electrical-resistivity, magnetic-susceptibility, and specific-heat measurements. It is found that the Tc decreases monotonically with Pr concentration x from Tc∼33 K for x=0 to Tc∼12 K for x=0.7. The critical concentration xcr required to suppress the Tc to zero is estimated to be around 0.85. Even though the PrSr2Cu2.7Mo0.3O7−δ exhibits a semiconducting behavior, the normal-state resistivity at T≥100 K remains nearly the same order of magnitude as that of superconducting YSr2Cu2.7Mo0.3O7−δ. An effective magnetic moment μeff∼3μB is obtained from the simple Curie-Weiss law and a huge linear term coefficient of specific heat γ∼440 mJ/mol K2 is determined for PrSr2Cu2.7Mo0.3O7−δ. No magnetic transition is observed for PrSr2Cu2.7Mo0.3O7−δ down to 0.6 K. However, a superconducting transition with Tc∼17 K is seen by partially substituting Ca for Pr in Pr1−xCaxSr2Cu2.7Mo0.3O7−δ. The similarities and differences in superconductivity and magnetism between Y1−xPrxSr2Cu2.7Mo0.3O7−δ and Y1−xPrxBa2Cu3O7−δ are compared and discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YSr2Cu2.7Mo0.3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33.2	Pressure not reported	midpoint
Y0.9Pr0.1Sr2Cu2.7Mo0.3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33.1	Pressure not reported	midpoint
Y0.8Pr0.2Sr2Cu2.7Mo0.3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31.6	Pressure not reported	midpoint
Y0.7Pr0.3Sr2Cu2.7Mo0.3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	29.7	Pressure not reported	midpoint
Y0.6Pr0.4Sr2Cu2.7Mo0.3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25.9	Pressure not reported	midpoint
Y0.5Pr0.5Sr2Cu2.7Mo0.3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22.2	Pressure not reported	midpoint
Y0.4Pr0.6Sr2Cu2.7Mo0.3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17.3	Pressure not reported	midpoint
Y0.3Pr0.7Sr2Cu2.7Mo0.3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	12.2	Pressure not reported	midpoint
Pr1-xCaxSr2Cu2.7Mo0.3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17	Pressure not reported	unknown